This is the most simple Plastron (Underarm Protector), typically purchased by beginning fencers. Being made up of 100% Cotton, this Plastron is definitely breathable and lightweight, a perfect match to go underneith your Cotton jacket.
The only downside to this uniform, is because it's mostly Cotton, it will shrink a bit when you wash it, mostly in length, and there is no putting these in the dryer! These also can be used for both Left Handed and Right Handed fencers, just turn them inside out to fit appropriately!
